Internal grinder or mill for use in lathes, boring, drilling, and other machine tools.



H. KERSHAW.

INTERNAL GRINDER 0R MILL FOR USE IN LATHES, BORING, DRILLING, AND OTHER MACHINE TOOLS.

APPLICATION FILED MAR-2.1918.

1,298,963.. Patented Ap r. 1,1919,

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HARRY KERSI-IAW, OF MANCHESTER, ENGLAND.

INTERNAL GRINDER OR MILL FOR USE IN LATHES, BORING, DRILLING, AND OTHER MACHINE TOOLS.

Specification of Letters Patent.

Patented Apr. 1, 1919.

Application filed March 2, 1918. Serial No. 220,037.

To all whom it may concern Be it known that I, HARRY KERSHAW, a subject of the King of Great Britain and Ireland, and a resident of Manchester, county of Lancashire, England, have invented a certain new and useful Improvement in Internal Grinders or Mills for Use in Lathes, Boring, Drilling, and other Machine Tools, of which the following is a specification.

This invention relates to internal grinding, milling, cutting and like machines of the type in which the grinding wheel or cutter is carried upon a rotary spindle which is eccentrically or radially adjustable for the purpose of feeding the grinding wheel or cutter to the internal surface of a cylinder or other work to be machined, and to the type in which the grinder, or mill or attachment comprises a fast-moving'member and a slow-moving member consisting 'of two parts secured together in eccentric relation to one another but moving as one, means for varying the eccentricity of the slow-moving member and means for driving said fast and slow-moving members independently of one another.

The present invention consists in certain novel combinations and arrangement, of parts as hereinafter described and pointed out in the appended claims.

The invention although hereinafter described and illustrated as applied to the nose of both hollow and solid lathe mandrels, is equally applicable for use with drilling, milling and other machine tools having hollow mandrels without any changes other than a change in the speed of rotation and the substitution of a cutter.

Of the accompanying sheets of drawings: I v

Figure 1 is a longitudinal sectional view of the grinder or mill mounted on the nose of the hollow mandrel of a lathe and set up to the work.

.Fig. 2 is .a section taken on line 00, a: of of F1g. 1. Fig. 3 is a front'view' of the rear member of the two-part slow-moving member.

Fig. 4c'is a section taken on line y, y of 2. v ig. 5 is a sectional view showing the means employed for driving the fast moving Fig. 5.

Like letters of reference indicate corresponding parts in the several figures.

Referring to the drawings,a is the hollow mandrel and 5' its nose which carries the slow-moving member which is constituted by a back and chuck-like member a screwed on to said nose, and a flanged. and tapered sleeve or front. member d. These back and front members a and d are secured together in eccentric relation to one another by means of two studs e'and f, which studs eand f are carried by the flange of the sleeved and front member d and extend through the flange of the back member 0. Of these studs, the stud e is a master stud and serves as a pivot by which the front member 03 can swing, while the other stud 7 passes through a radial'slot gFigs. 2, 3 and 4-in theflange of the rear member 0, said studs 6 and f being provided with nuts 72. which look the two members together in place after having been set over on a cut.

rear end k of said spindle is being made square to slide in the pulley j by which it is driven, while the front end 70* of said spindle k takes in suitable bearings 0* in the chuck-like member a of the slow-moving member.

The nose end d of the sleeved member (1 is provided with means for preventing dust creeping into the bearings of the spindle is, and such means may consist in slightly counter-sinking the face 01 of said nose endd and covering the same with a cap Z which presses a series of soft asbestos or cotton composite washers l against said face d with sufficient pressure to keep dust from creeping in and oil from creeping out, but not enough to retard the speed of the spindle 76 or to overheat the same.

The line adjustment, or cut, or set, 'viz the eccentricity of thesleeved member of the slow-moving member carrying the spindle '70 of the fast-moving member or flexible shaft is effected by means of a fine pitched screw m-Figs. 3 and 4c-fitted in and across the flange of theslow-moving. member 0 and screwing through a block a slidably mount ed in a recess 0 in said flange, said block n being provided with jaws 11* which embrace the stud f carried by. the flange of the sleeved and slow-moving member d. This screw m when turned by a key or the like shifts the block 92 along the recess 0, and by the engagement of its jaws of with the stud f which extends through the radial slot 9 causes the sleeved member (Z and fast-moving spindle to be thrown, the floating spindle is moving accordingly, over on the stud f ever solittle, or the full range as required, the jawed block at engaging saidstud f with clearance for the radial movement.

In the arrangement shown in Figs. 5 and 6, the fast-moving member is driven through toothed gear inthe following manner :-On the; spindle 70* oft-he fast-moving member is mounted a pinion 10* located in the bore 0' of the slow-moving member 0, and this pinion k meshes with a pinon 0 rotatablymounted on a stud c fixedly carried by the member 0.

This pinion c which extends through a slot in the wall of the boss of the member 0 engages with the internal teeth 0* of a ring 0 said ring 0 which surrounds the boss of the slow-moving member 0, being rotatably mounted on ball bearings andprovided with flanges to form a flanged pulley a which is driven by a belt 9 from a countershaft (not shown).

In-.action, external wheel or ring 0 drives p nion 0 at increased speed, pinion 0 drives plnion k and with it spindle ki whichspindle 70* transmits rotation to grinding wheel 2' in the-manner before set forth. The inner end of spindle 70* is made square so that it may slide in the pinion 70* when the grinding wheel is set; over to work as in the previous arrangement. Instead of the fast-moving spindles. 7c and It being coupled together by floating spindle is and universal joints 70 said spindles k and 70 may be connected together by flexible cable shaft working without universal joints.

Having now described myiinvention, what I claim-as new and desire to secure by- Letters Patent ofthe United States .is

1. An internal grinder or mill for use in solid "mandrel; lathes, boring, drilling and other "machine tools, comprising a slow-moving member consisting of aback or nosed member and avsleeved fronti member carrying a spindle rotatably mounted therein, said back and front members being pivotally connected together so as to be set in eccentric relation to one another, means for varying the eccentricity of saidback and front members, a grinding wheel or other cutter carried by said spindle, a'bearing located'in'the bore of the back or nosed member, a spindle rotatably mounted in said bearing and inthe hollow mandrel, flexible means connecting said two spindles, said flexible means being located in the sleeved slow-moving member, a. pinion fixed to the spindle mounted in the back or nose member, a pinion loosely mounted in and carried by the=body of said nose member and engaging the aforesaid pinion andaninternally toothed rin or pulley engaging said second pinion, sai toothed ring or pulley being. mounted exteriorly. of the boss of the back member and carried on ball bearings.

2. A grinding attachment for lathes including the combinationwith the lathe spinhoused within said casing member and slow moving member, said shaft consistmg of a cutter carrying section v ournaled 1nv the small. .end of 'the cone shaped. housing, a

driven shaft section journaled in the antifriction bearing of theslow moving member, and an intermediate coupling sectionihaving a universal joint connection respectively with the ends of the cutter carrying and driven sections of the shaft, said coupling section being located wholly within the.en larged tapered portion of the housing adjacent the slow moving member.

' 3; A grinding attachment for .lathesincluding the combination with the spindle thereof, al-slow moving-.memben detachably fitted to said spindle and consisting of -.a flanged face portion anda hub portion having therein a threaded socket for receiving the threaded end of the lathe spindle, and an anti-friction bearing at one side of the threaded portion, a substantially cone shaped housing pivotally carried by the flanged portion ofthe. slow moving member,

moving member, a flexible high speed shaft I means for shifting the entire houslng-eccen- "trically with reference to, theslow moving member, a high speed shaft havingzthe major portion thereof concealed within the-cone shapedhousing and consistingof a cutter carrying section journaled in the forward end of said housing, a driven section journaled in the anti-friction bearing of theslow moving member, .an. intermediatecoupling section having universal joint connections respectively with the cutter carrying and driven sections, and means for drivng said driven section consistin of a gear carried 5 thereby adjacent the anti-friction bearing, a

stub shaft mounted in the slow moving member parallel to the driven section, a gear on the latter shaft meshing with the gear on the driven section of the high speed shaft, and a 10 driving pulley rotatably mounted on the hub portion of the slow moving member and having an interior rack for meshing with the gear on the stub shaft.

In testimony whereof I have afiixed my signature hereto this 24th day of January, 15

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Yatents.

' Washington, D. G. 

